[PATCH] D48250: [sanitizer_common] Use O_TRUNC for WrOnly access mode.

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

Added test. BTW, is my testing correct?

  ninja -C ~/Dev/llvm/release TSanitizer-x86_64-Test TSanitizer-x86_64-Test-Nolibc && ~/Dev/llvm/release/projects/compiler-rt/lib/sanitizer
  _common/tests/Sanitizer-x86_64-Test
  # passed


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D48250